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简介：
一、单数、复数：
1.is(复数)are
2.am(复数)are
3.are(单数)is
4.library(复数)libraries
5.story(复数)stories
6.factory(复数)factories
7.body(复数)bodies
8.hobby(复数)hobbies
9.people(复数)people
10.fish(复数)fish
11.policeman(复数)policemen
12.city(复数)cities
13.firemen(复数)firemen
14.children(单数)child
15.man(复数)men
16.woman(复数)women
17.oranges(单数)orange
18.foot(复数)feet
19.tooth(复数)teeth
20.you(复数)you
21.peach(复数)peaches
22.box(复数)boxes
23.I(复数)we
24.he/she/it(复数)they
二、完整形式：
1.isn't(完整形式)is not
2.aren't(完整形式)are not
3.there's(完整形式)there is
4.it's(完整形式)it is
5.they're(完整形式)they are
6.he's(完整形式) he is
7.she's(完整形式)she is
8.we're(完整形式)we are
9.I'm(完整形式)l am
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